Abstract: controls the media access, therefore, no one can access the bus unless it got an approval required from , requirements of the USB specification revision 1.1. In CLK CRISTAL XTAL1 XTAL2 REGULATOR VCC

Abstract: (simplifies the designing of USB devices). The host controls the media access, therefore, no one can access , conditions, so TVS devices must be added for these purposes. CLK CRISTAL XTAL1 XTAL2 VCC GND